混凝土配重层对近海海底钢质管道阴极保护效果的影响

doi:10.11902/1005.4537.2025.237

中国腐蚀与防护学报 DOI: 10.11902/1005.4537.2025.237

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混凝土配重层对近海海底钢质管道阴极保护效果的影响

王萌萌¹,曹国民²,孟繁兴¹,李天亮³,宋沁峰³,单太航³,董亮³

1. 国家管网集团东部储运公司科技研发中心
2. 国家管网集团东部原油储运有限公司
3. 常州大学

The influence of Concrete counterweight layer on cathodic protection effect of nearshore submarine steel pipes

引用本文:

王萌萌曹国民孟繁兴李天亮宋沁峰单太航董亮. 混凝土配重层对近海海底钢质管道阴极保护效果的影响[J]. 中国腐蚀与防护学报, 10.11902/1005.4537.2025.237.

全文: PDF(3509 KB)

摘要: 为探究混凝土配重层对近海海洋环境中的海底管道阴极保护效果的影响，采用稳态恒电位极化、电化学阻抗谱（EIS）和数值模拟计算方法，系统研究了X60裸钢和带混凝土配重层的X60钢在不同盐度（盐度5‰、16.8‰、26.7‰）静态海水和海泥以及2m/s流动海水的阴极极化行为，并测试了混凝土配重层电阻率，获得了混凝土配重层影响下的管道阴极保护电位分布和牺牲阳极输出电流。结果表明，在5‰、16.8‰、26.7‰盐度的静态海水和海泥中达到-0.85V（CSE）极化电位时，X60裸钢所需的阴极极化电流密度约为带混凝土配重层的X60钢所需的3.5~8倍。在2m/s流动海水中，对应电位下带混凝土配重层的X60钢所需的阴极极化电流密度与在静态海水中差异相对较小，流速会明显提升X60裸钢所需的阴极极化电流密度，这与流速增大氧的扩散和破坏钙质沉积层有关，而混凝土配重层阻碍了流速的这种影响。电化学阻抗谱测得的极化电阻的变化与极化电流密度的变化规律一致，同时获得的海水中混凝土配重层电阻率约为对应海水电阻率的70倍，海泥中混凝土配重层电阻率约为对应海泥电阻率的37倍。数值模拟结果显示，混凝土配重层降低阴极极化电流密度使得阴极保护电位负移明显且电位衰减小，混凝土配重层电阻率降低了牺牲阳极的输出电流而使得阴极保护电位稍正移。混凝土配重层对于改善海底管道阴极保护效果作用明显。

关键词 ： X60钢, 混凝土配重层, 阴极极化, 电化学阻抗谱, 近海海洋环境, 数值模拟

Abstract：To investigate the effect of concrete weighted layer on cathodic protection of submarine pipes in nearshore marine environments, steady-state constant potential polarization, electrochemical impedance spectroscopy (EIS), and numerical simulation methods were used to systematically study the cathodic polarization behavior of bare X60 steel and concrete weighted X60 steel in static seawater at different salinities (5 ‰, 16.8 ‰, 26.7 ‰) and mud, as well as 2m/s flowing seawater. The resistivity of the concrete weighted layer was also tested, and the cathodic protection potential distribution and sacrificial anode output current of the pipe under the influence of the concrete weighted layer were obtained. The results showed that when the polarization potential of -0.85V (CSE) was reached in static seawater with salinities of 5 ‰, 16.8 ‰, and 26.7 ‰ and mud, the cathodic polarization current density required for bare X60 steel was about 3.5-8 times that of X60 steel with a concrete weight layer. In 2m/s flowing seawater, the difference in cathodic polarization current density required for X60 steel with concrete weight layer under corresponding potential is relatively small compared to static seawater. The flow velocity will significantly increase the cathodic polarization current density required for bare X60 steel, which is related to the diffusion of oxygen and the destruction of calcium deposition layer due to the increase in flow velocity. However, the concrete weight layer hinders this effect of flow velocity. The change in polarization resistance measured by electrochemical impedance spectroscopy is consistent with the change in polarization current density. At the same time, the resistivity of the concrete weight layer in seawater is about 70 times that of the corresponding seawater resistivity, and the resistivity of the concrete weight layer in marine mud is about 37 times that of the corresponding marine mud resistivity. The numerical simulation results show that the concrete weight layer reduces the cathodic polarization current density, resulting in a significant negative shift and small potential attenuation of the cathodic protection potential. The concrete weight layer reduces the output current of the sacrificial anode, resulting in a slightly positive shift of the cathodic protection potential. The concrete weighted layer has a significant effect on improving the cathodic protection effect of submarine pipes.

Key words： X60 steel concrete counterweight layer cathodic polarization electrochemical impedance spectroscopy nearshore marine environment numerical simulation

收稿日期: 2025-07-28

ZTFLH:

TG172

基金资助:海底管道状态检测与安全评估技术研究

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	王萌萌
	曹国民
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	宋沁峰
	单太航
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链接本文:

https://www.jcscp.org/CN/Y0/V/I/0

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